Featured Puzzle: Fillomino #3
Fillomino is a popular Japanese puzzle. Divide the grid into polyomino regions that each contain a single number, ranging from 1-9.
Featured Puzzle: Flower Sudoku #1
One common Christmas decoration, especially in the southern United States, is the poinsettia flower. In honor of that, today’s puzzle is Flower Sudoku. This is five overlapping Sudoku grids, in which the central grid is completely covered by the four outer grids.
Featured Puzzle: Foil the Gunpowder Plot!
The Royal Guard has discovered Guy Fawkes skulking around in the cellars beneath the House of Lords. He has confessed to a wicked plot, but we must still find the gunpowder with which the plan was to be carried out!
Featured Puzzle: Fold-a-Box #1
When I was a kid, origami was a hobby I delved into with a passion. All these years later, and I just discovered that November 11th is World Origami Day! Today’s puzzle, originally named Yokibunkastu (“container dividing”), is themed around folding, so I thought it would be appropriate for the occasion. Draw walls to form pentomino (5-cell) regions around the paper cranes.
Featured Puzzle: Fold-a-Box #2
Boxing Day is celebrated in many countries around the world, usually the day after Christmas. Originally, it was the day that alms boxes were opened, and the contents distributed among the poor. Today, some of that spirit remains, but it’s also a shopping holiday similar to Black Friday. Naturally, it seemed a good fit for a Fold-a-Box puzzle. Draw walls to create pentominoes to box up the various gifts.
Featured Puzzle: From 1 to X #1
Fill in the grid with numbers from 1 to X, where X is the size of the region. You can’t repeat digits within a region, or in orthogonally adjacent cells. Numbers outside the grid are the sum of digits in that row or column.
Featured Puzzle: From 1 to X #2 – Happy Math 2.0 Day
Created in 2009 by the Math 2.0 Interest Group, Math 2.0 Day celebrates the meeting of math and technology. Think of all the technological innovations you enjoy – at some point, a mathematician was involved to make it happen. So, to any student wondering where they’ll use math in the real world? Everywhere! Today’s puzzle is From 1 to X, a grid puzzle which involves some light math.
Featured Puzzle: Galaxies #1 – Wrapping Presents
It’s the time of year for every parent’s favorite task. Figure out how to wrap oddly-shaped packages! Of course, for this puzzle, the boxes are invisible! Each bow is already in place, and you must draw the border lines to reveal all the presents.
Featured Puzzle: Galaxies #2
It’s a starry night, and the sky is filled with galaxies. In this puzzle, divide the grid into irregular regions with a galaxy at the exact center.
Featured Puzzle: Heyawake #1
Shade cells in each region equal to the number given. If a region has no number, it may have any number of shaded cells, including zero. The remaining unshaded cells must form a single orthogonally contiguous area.